Check the actual SPBRG value used, for 19200 baud at 20MHz use:-

SPBRG = 64 (decimal)
BRGH = 1

I have a spreadsheet that works out the above. Gives 19231 baud wich
is 0.16% error.

As your loop back test, works and assuming the above is OK, scope
your TxD to see what is really happening and also check your 20MHz
crystal is running at the right speed.

I like using a more flexible PC comms program than hyperterminal,
like this one: http://bray.velenje.cx/avr/terminal

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Brent Brown, Electronic Design Solutions
16 English Street, Hamilton, New Zealand
Ph/fax: +64 7 849 0069
Mobile/txt: 025 334 069
eMail:  brent.brown@clear.net.nz

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